About Isaac Jennings
Lived 1788 – 1874 (aged 85). Isaac Jennings was an American physician.
Isaac Jennings (November 7, 1788 March 13, 1874) was an American medical doctor and writer who pioneered orthopathy (natural hygiene).
Biography
Jennings was born on November 7, 1788, in Fairfield, Connecticut. He studied medicine with Eli Ives of New Haven. He was licensed to practice medicine and located himself in Trumbull, Connecticut. He obtained his M.D. from Yale in 1828. His patients health improved but caused controversy when his secret was revealed and his patients requested medicine. He refused to prescribe medicine and his career was damaged. The experiment convinced him that drugs were worthless and by the 1830s, he even discarded placebos. He believed that only nature could "restore her damaged machinery and revitalize it."
In 1839, he became a member of the Board of Trustees of the Oberlin College. In 1847 at the college, he wrote his book Medical Reform. He prescribed bathing, rest and a vegetarian diet as part of his system.
His no-medicine plan was based on the idea of vitalism. He believed that nature does its best to keep the human system in health and to give the best opportunity for the "vital forces" to work, the patient must rest and not be disturbed by medicine or stimulants. A review of his book The Tree of Life suggested it was "without a particle of merit" and the ideas would not be popular with people of the present day.
Jennings died of pneumonia on March 13, 1874, in Oberlin, Ohio.
Publications
Medical Reform: A Treatise on Man's Physical Being and Disorders (1847) The Philosophy of Human Life (1852) The Tree of Life: Or, Human Degeneracy, its Nature and Remedy: Based on the Elevating Principle of Orthopathy (1867)
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Important facts
People in Isaac Jennings's life
Named in this biography and alive at the same time
Contemporaries
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Frequently asked questions
Who was Isaac Jennings?
American physician
When was Isaac Jennings born?
Isaac Jennings was born on 17 November 1788 in Fairfield.
When did Isaac Jennings die?
Isaac Jennings died on 13 March 1874 in Oberlin, Ohio.
What was Isaac Jennings's occupation?
Isaac Jennings was a physician.
What nationality was Isaac Jennings?
Isaac Jennings was American.
Sources & further reading
Cite this page
APA: Biography.guide. (2026). Isaac Jennings. https://biography.guide/isaac-jennings/
MLA: "Isaac Jennings." Biography.guide, https://biography.guide/isaac-jennings/.
Chicago: "Isaac Jennings." Biography.guide. https://biography.guide/isaac-jennings/.
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